Used to separate and grade soil samples. Four interlocking plastic sieves each have a different size brass wire mesh screen. Wire mesh sizes are 5, 10, 60 and 230 holes per cm. Mesh openings measure 3.35 mm, 0.86 mm, 0.38 mm and 0.14 mm, respectively. Each sieve is 6" in diameter and 2" tall. Complete with a solid bottom container and a snap-on lid. Set of four.